Final answer:
The Spanish word that best completes the sentence is 'operiódico' meaning 'newspaper'
Step-by-step explanation:
The Spanish word that best completes the sentence 'A mi mejor amigo le gusta (blank) en la escuela' is operiódico, which means 'newspaper' in English. This word indicates that the friend likes to read newspapers at school. Other options do not fit the context of the sentence. For example, 'oprograma' means 'program,' 'ocampeonato' means 'championship,' and 'oluchar' means 'to fight.'
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